May 12 ------ The Philippine Institute of Volcanology and Seismology (Phivolcs) on Tuesday evening, May 11, raised the status of Mt. Bulusan to Alert Level 1 as the active volcano in Sorsogon manifested a “low-level unrest.” Phivolcs said Bulusan Volcano’s monitoring network has recorded a total of 124 earthquakes since May 8, 2021. It warned that the volcano’s increased seismicity “could be followed by steam-driven or phreatic eruptions at the summit crater or from flank vents on the upper to middle slopes.”
Phivolcs also observed sustained inflation of the upper slopes that began on March 6, 2021, consistent with short-term inflation of the edifice measured by continuous GPS monitoring since February 2021. “These parameters indicate that volcanic processes are underway beneath the edifice that are likely caused by shallow hydrothermal activity,” it said. From a normal status (Alert Level 0), Phivolcs said “abnormal” status (Alert Level 1) now prevails over Bulusan Volcano.
Source: mb.com.ph